The test principle of the tracer wire

The copper-clad steel is made of a steel core wire and a copper layer that is tightly clad to form a metal core, and the outer side is a PE anti-corrosion layer. The copper core wire is generally composed of the copper core wire of the inner layer, the insulating foreskin of the intermediate layer and the protective outer layer of the outer layer. The copper-clad aluminum is composed of an aluminum core wire and a copper layer that is tightly coated to form a metal core, and the outer layer is a PE anti-corrosion layer.

Because the anti-corrosion layer of the outer layer of the steel gas pipeline is a plastic layer or coating with insulation and anti-corrosion properties, it is similar to the outer layer of copper-clad steel, copper core wire, and copper-clad aluminum and other plastic layers with insulation and anti-corrosion properties. Therefore, we will be equivalent to detect the average insulation quality of the anti-corrosion layer of the tracer wire anti-corrosion layer by using the PCM pipeline current attenuation rate method. The detection principle is to apply a current signal of a certain frequency to the tracer wire, which will gradually decay when the current is transmitted from the tracer to the distance. The attenuation size is related to the insulation resistivity of the plastic layer of the tracer wire. The higher the average insulation resistivity of the plastic layer of the tracer wire, the slower the current attenuation, and vice versa, the faster the attenuation.